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Tucson (/ˈtuːsɒn, tuːˈsɒn/; Spanish: Tucson, O'odham: Cuk-Ṣon) is a city in and the county seat of Pima County, Arizona, United States, and is home to the University of Arizona. It is the second largest city in Arizona behind Phoenix, with a population of 542,629 in the 2020 United States census, while the population of the entire Tucson metropolitan statistical area (MSA) is 1,043,433. The Tucson MSA forms part of the larger Tucson-Nogales combined statistical area (CSA). Both Tucson and Phoenix anchor the Arizona Sun Corridor. The city is 108 miles (174 km) southeast of Phoenix and 60 mi (97 km) north of the U.S.–Mexico border. Tucson is the 34th largest city and the 53rd largest metropolitan area in the United States (2014).

Major incorporated suburbs of Tucson include Oro Valley and Marana northwest of the city, Sahuarita south of the city, and South Tucson in an enclave south of downtown. Communities in the vicinity of Tucson (some within or overlapping the city limits) include Casas Adobes, Catalina Foothills, Flowing Wells, Midvale Park, Tanque Verde, Tortolita, and Vail. Towns outside the Tucson metro area include Benson to the southeast, Catalina and Oracle to the north, and Green Valley to the south.

Tucson was founded as a military fort by the Spanish when Hugo O'Conor authorized the construction of Presidio San Agustín del Tucsón in 1775. It was included in the state of Sonora after Mexico gained independence from the Spanish Empire in 1821. In 1853, the United States acquired a 29,670 square miles (76,840 km2) region of present-day southern Arizona and southwestern New Mexico from Mexico under the Gadsden Purchase. Tucson served as the capital of the Arizona Territory from 1867 to 1877. Tucson was Arizona's largest city by population during the territorial period and early statehood, until it was surpassed by Phoenix by 1920. Nevertheless, population growth remained strong during the late 20th century. In 2017, Tucson was the first American city to be designated a "City of Gastronomy" by UNESCO.

Lhasa, referred to as "La" for short, is the capital of China's Tibet Autonomous region, an international tourist city with plateau and ethnic characteristics, the political, economic, cultural, scientific and educational center of Tibet, and the holy place of Tibetan Buddhism. Located in the middle of the Tibetan Plateau, north of the Himalayas, 3650 meters above sea level (to prevent endogenous oxygen deficiency), is located in the valley plain of the middle reaches of the Lhasa River, a tributary of the Yarlung Zangbo River, which flows through it and flows into the Yarlung Zangbo River in the southern suburbs. Lhasa has sunny weather all year round, with little rainfall, no severe cold in winter, no heat in summer and pleasant climate. The sunshine time of the whole year is more than 3000 hours, which is known as "Sunshine City". Lhasa is rich in all kinds of resources, which has obvious resource advantages compared with other prefectures and cities in the country and the autonomous region. As the first batch of famous historical and cultural cities in China, La
Travel Sights In Lasa、Lhasa
Travel Notes In Lasa、Lhasa
Back to Lhasa, never tired of seeing the scenery again and again
I came to Lhasa six years ago during my graduation trip, and I only used it as a transit point to go to Nepal. Lhasa at that time gave me a lot of sho
Living in Lhasa, people who live in the snow-covered plateau are so happy
【Lhasa】Drunk Sunshine City "I fantasized since I was very youngjust fantasize about going to a faraway placeToday I walk in Lhasa, the heavenly LhasaT
The secret Lhasa, magnificent scenery, driving the North Ring Road, feeling the rich landforms and humanities of the Qinghai-Tibet Plateau
How far is it from Lhasa? Fly in the clouds for 6 hours. About Lhasa, I always have too many things to say. This city of sunlight contains too much of
The sky within reach, bright and colorful Tibet (Lhasa + Yamdrok + Linzhi)
Tibet has been in my mind for a long time. . . . . . I have been just thinking about it, and every time I plan to take action, I always make excuses,